Java androidsqlite删除相关表

我在下面编辑了以下表cheme://Solution

您可以看到一个泛化[不相交，总计]。 当我删除关系“Ziel”中的一行时，我希望删除相关表中的相关行

例如，在Koerper Ziel中有一个条目：

R（Ziel）={{1,7，null，null，…}

R（Koerper-Ziel）={{7，…}

删除（1）将删除这两个条目^

SQLite代码：

private static final String CREATE_TABLE_ZIELE_KOERPER =  "CREATE TABLE " + TABLE_ZIELE_KOERPER + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_OPTION       + " INTEGER, "   +
            COLUMN_TENDENZ      + " INTEGER );";

    private static final String CREATE_TABLE_ZIELE_CARDIO =  "CREATE TABLE " + TABLE_ZIELE_CARDIO + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_EXTRA        + " TEXT );";

    private static final String CREATE_TABLE_ZIELE_TRAINING =  "CREATE TABLE " + TABLE_ZIELE_TRAINING + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_EXTRA        + " TEXT, "      +
            COLUMN_MUSKEL       + " TEXT, "      +
            COLUMN_WIEDERHOLUNGEN + " INTEGER );";

    private static final String CREATE_TABLE_ZIELE = "CREATE TABLE " + TABLE_ZIELE + "(" +
            COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_NAME         + " TEXT, "      +
            COLUMN_ERSTELLDATUM + " LONG, "      +
            COLUMN_DEADLINE     + " LONG, "      +
            COLUMN_DONE         + " INTEGER, "   +
            COLUMN_VALUE        + " FLOAT, "     +
            COLUMN_FORTSCHRITT  + " FLOAT, "     +
            COLUMN_K_ID         + " INTEGER, "   +
            COLUMN_C_ID         + " INTEGER, "   +
            COLUMN_T_ID         + " INTEGER, "   +
            "FOREIGN KEY(" + COLUMN_K_ID + ") REFERENCES " + TABLE_ZIELE_KOERPER      + "(" + COLUMN_ID + ")  ON DELETE CASCADE, " +
            "FOREIGN KEY(" + COLUMN_C_ID + ") REFERENCES " + TABLE_ZIELE_CARDIO       + "(" + COLUMN_ID + ")  ON DELETE CASCADE, " +
            "FOREIGN KEY(" + COLUMN_T_ID + ") REFERENCES " + TABLE_ZIELE_TRAINING     + "(" + COLUMN_ID + ")  ON DELETE CASCADE  " +
            ");";

但它还不起作用。 我认为问题在于级联上的

DELETE

只能反向工作。如何更改代码

编辑：

添加Koerperziel：

private long addKoerperziel(KoerperZiel ziel){
        ContentValues values = new ContentValues();
        SQLiteDatabase db = getWritableDatabase();
        //Anlegen in der Relation TABLE_ZIELE_KOERPER
        values.put(COLUMN_OPTION,       ziel.getKoerperZielOption());
        values.put(COLUMN_TENDENZ,      ziel.getTendenz());
        long kID = db.insert(TABLE_ZIELE_KOERPER, null, values);
        //Anlegen in der Relation TABLE_ZIELE mit der kID als Fremdschluessel
        values.clear();
        values.put(COLUMN_K_ID, kID);
        values.put(COLUMN_NAME,         ziel.name);
        values.put(COLUMN_ERSTELLDATUM, ziel.erstellDatum.getTime());
        values.put(COLUMN_DEADLINE,     ziel.deadline.getTime());
        values.put(COLUMN_DONE,         ziel.isDone());
        values.put(COLUMN_VALUE,        umrechnenKoerperZielValue1Add(ziel.getKoerperZielOption(), ziel.value));
        values.put(COLUMN_FORTSCHRITT,  ziel.progress);
        return db.insert(TABLE_ZIELE, null, values);
    }

编辑2：

 private static final String CREATE_TABLE_ZIELE_KOERPER =  "CREATE TABLE " + TABLE_ZIELE_KOERPER + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_OPTION       + " INTEGER, "   +
            COLUMN_TENDENZ      + " INTEGER, "   +
            COLUMN_Z_ID         + " INTEGER, "   +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE_CARDIO =  "CREATE TABLE " + TABLE_ZIELE_CARDIO + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_EXTRA        + " TEXT," +
            COLUMN_Z_ID         + " INTEGER, "   +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE_TRAINING =  "CREATE TABLE " + TABLE_ZIELE_TRAINING + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_EXTRA        + " TEXT, "      +
            COLUMN_MUSKEL       + " TEXT, "      +
            COLUMN_WIEDERHOLUNGEN + " INTEGER, " +
            COLUMN_Z_ID         + " INTEGER, "   +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE = "CREATE TABLE " + TABLE_ZIELE + "(" +
            COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_NAME         + " TEXT, "         +
            COLUMN_ERSTELLDATUM + " LONG, "         +
            COLUMN_DEADLINE     + " LONG, "         +
            COLUMN_DONE         + " INTEGER, "      +
            COLUMN_VALUE        + " FLOAT, "        +
            COLUMN_FORTSCHRITT  + " FLOAT );";

解决方案

 private static final String CREATE_TABLE_ZIELE_KOERPER =  "CREATE TABLE " + TABLE_ZIELE_KOERPER + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, "    +
            COLUMN_OPTION       + " INTEGER, "                              +
            COLUMN_TENDENZ      + " INTEGER, "                              +
            COLUMN_Z_ID         + " INTEGER, "                              +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE_CARDIO =  "CREATE TABLE " + TABLE_ZIELE_CARDIO + "(" +
            COLUMN_ID           + " INTEGER PRIMARY KEY AUTOINCREMENT, "    +
            COLUMN_EXTRA        + " TEXT,"                                  +
            COLUMN_Z_ID         + " INTEGER, "                              +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE_TRAINING =  "CREATE TABLE " + TABLE_ZIELE_TRAINING + "(" +
            COLUMN_ID               + " INTEGER PRIMARY KEY AUTOINCREMENT, "    +
            COLUMN_EXTRA            + " TEXT, "                                 +
            COLUMN_MUSKEL           + " TEXT, "                                 +
            COLUMN_WIEDERHOLUNGEN   + " INTEGER, "                              +
            COLUMN_Z_ID             + " INTEGER, "                              +
            "FOREIGN KEY(" + COLUMN_Z_ID + ")   REFERENCES " + TABLE_ZIELE      + "(" + COLUMN_ID + ")  ON DELETE CASCADE"  +
            ");";

    private static final String CREATE_TABLE_ZIELE = "CREATE TABLE " + TABLE_ZIELE + "(" +
            COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_NAME         + " TEXT, "         +
            COLUMN_ERSTELLDATUM + " LONG, "         +
            COLUMN_DEADLINE     + " LONG, "         +
            COLUMN_DONE         + " INTEGER, "      +
            COLUMN_VALUE        + " FLOAT );";

---

只有在被引用表中存在已删除的条目时，才会删除On delete cascade。因此，要获得级联效果，可以从KID、CID、TID表中删除，或者如果要从ZIEL表中删除并使其级联，请将外键约束移动到KID、CID、TID表中

我还建议更改您的模式，使KID、CID、TID表都有一个ZIEL id，这样就不需要在ZIEL表中使用null KID、CID或TID值

这就是我将如何更改您的模式（基于我所知道的您正在尝试执行的操作）

餐桌

COLUMN_ID, COLUMN_NAME, COLUMN_ERSTELLDATUM, COLUMN_DEADLINE, COLUMN_DONE, COLUMN_VALUE, COLUMN_FORTSCHRITT

表_ZIELE_KOERPER

COLUMN_ID, COLUMN_OPTION, COLUMN_TENDENZ, ZIEL_ID -> FOREIGN KEY(ZIEL_ID) REFERENCES ZIEL(COLUMN_ID)

有氧运动桌

COLUMN_ID, COLUMN_EXTRA, ZIEL_ID -> FOREIGN KEY(ZIEL_ID) REFERENCES ZIEL(COLUMN_ID)

TABLE_ZIELE_培训

COLUMN_ID, COLUMN_EXTRA, COLUMN_MUSKEL, COLUMN_WIEDERHOLUNGEN, ZIEL_ID -> FOREIGN KEY(ZIEL_ID) REFERENCES ZIEL(COLUMN_ID)

---

现在，如果从表中删除，它将层叠起来并删除相关KOERPER、CARDIO或TRAINING表中的条目

Ok added。在另一个关系中，级联删除有效。您确定两个表中的id相同吗？如何设置父表（ZIELE）中的列K、列C和列id？子项中的自动递增对我来说似乎很奇怪，因为它们充其量只是一对一的关系，子项中的每个新条目都会产生不同的id（并且需要一个新的父项来引用它）。当然，如果是一对一很好，只是出于好奇好吧，如果我理解正确的话，每个ZIEL条目只能有一个KOERPER-ZIEL条目。因为每次插入KOERPER-ZIEL时都要创建ZIEL条目？另外，当您想在现有的ZIEL条目中添加一个CARDIO-ZIELE条目时，您会怎么做。我只是试图理解设计，因为我发现bugOne Ziel条目指的是一个特殊的Ziel。所以其中一个外键有一个id，另外两个为空。这是完全不相交的推广。我是在大学里学的。

COLUMN_ID, COLUMN_EXTRA, COLUMN_MUSKEL, COLUMN_WIEDERHOLUNGEN, ZIEL_ID -> FOREIGN KEY(ZIEL_ID) REFERENCES ZIEL(COLUMN_ID)